Fig. 7
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Luminosity of a binary system with a total mass of 12 M⊙ versus the mass of the primary member. The solid line corresponds to two ZAMS stars. The red dashed curve is for two protostars deriving their luminosity from accretion, for an accretion rate of 10–3 M⊙ yr–1. The long-dashed horizontal line marks the bolometric luminosity of IRAS 20126+4104.
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